Tempering apparatus for making band saws or the like



1953 HlROKl KAJIYAMA 2,627,572

TEMPERING APPARATUS FOR MAKING BAND SAWS OR THE LIKE Filed Jan. 17, 1952.Illll (r Patented Feb. 3, 1953 TEMPERING APPARATUS FOR MAKING BAND SAWSOR. THE LIKE Hiroki Kajiyama, Kure City, Hiroshima-Ken,

Japan I Application January 17, 1952, Serial No. 266,819

lclaim. ((1219-47) The present invention relates to an apparatus forhardening or tempering iron strips or bands to make band saws for metalbars, pipes, plates and the like.

According to the invention, not only band saws for metalor alloy-sawingbut also files or the like may be obtained.

An embodiment of apparatus for tempering iron band in accordance withthe present invention will be illustrated in the accompanying drawings,where Figure 1 shows its front elevation,

Fig. 2 its side elevation,

Fig. 3 schematically illustrated perspective view of its upper portion,and

Fig. 4 the enlarged perspective view of the high frequency electriccurrent induction device, desi nated by H in Fig. 2, insulator beingremoved in order to disclose clearly the electric circuit.

In the drawings, denotes a table plate, 2 and i2 side plates, 3 arectangle shaped frame mounted on the side plates 2 and 2 and 4 aU-shaped frame mounted on the side plates l2 and l2. A main shaft isborne at its end in openings bored through the side plates 2 and 2.Toothed wheels and l are fixed to the main shaft 5. Another shaft isborne at both ends in elliptical openings at bored through the sideplates 2 and 2, aligning with the said shaft 5. A toothed wheel 9 isfixed at one end of the shaft 8 and gears with the said toothed wheel 6.Rollers Ill and II are fixed to the said shafts '5 and 8 respectively soas to keep enough aperture between themselves to receive an iron band [4to be tempered.

When the main shaft 5 is driven by an electric motor (not shown in thedrawings), the toothed wheel 6 and the roller I rotates in one directionwhile the toothed wheel 9 and the roller rotates in opposite direction,thus the pair of rollers It! and H moving the iron band l4 downwards.

The apparatus in accordance with this invention has several devicessimilar to that above explained, consisting of the rollers l0 and II,the toothed wheels 6 and 9 and the shafts and 8. In the drawings fivesimilar devices are shown.

A shaft it which is driven by means of toothed wheels l3 and 1, gearedin turn, corresponds to the shaft 5 and a toothed wheel |6 correspondsto the toothed wheel 6. Another toothed wheel l9 corresponds to thetoothed wheel 9 while a shaft l8 corresponds to the'shaft 8. A pair ofrollers and 2|, which correspond to those l0 and I! respectively, movethe iron band i4 downwards in co-operation with the pair of rollers l0and II. Driving action of the shaft lb of the second device aboveillustrated is transmitted to the shaft of the third similar device by-atoothed wheel corresponding to the toothed wheel 13. The driving actionof the third device is then transmitted to the shaft of the fourthsimilar device by means of a chain 25 belting over toothed wheels 22 and24. Transmission of driving action from the fourth device to the fifthdevice is conducted by a toothed wheel similar to I! or 1. Thus the ironband moving action is co-operated by five pairs of rollers ineluding thepair of ill and II as well as the pair of 20 and 2|.

The shaft I8 is borne at both ends in elliptical openings similar to 39.That is quite similar in the third, fourth and fifth device.

The elliptical openings admit the iron band, thinner or thicker, to beheld between the pairs of rollers l0 and II, 20 and 2| and the like, thepressing actions being exerted by pairs of pressing rollers 26 and 25attached at both ends of levers consisting of shafts 21 and arms 28, thelatter being pulled elastically by means of springs 25) and turnbuckle30.

Between the third and fourth device aforesaid, a high frequency electriccurrent induction device H is located as shown in Fig. 1 and Fig. 2. Itsconstruction may be more easily understood by observing Fig. 4 whereboth leg portions of the device are denoted by 3| and 32, cooling pipesby 34 and 34, and a source of high frequency electricity by 35. Highfrequency electric current circulates in the direction of arrowsindicated by e through the conductor wound and bent as shown in Fig. 4and its both ends 3| and 32 to heat the iron band l4 moving through thepassage 33 covered with heat-resisting insulators 33 and 33, not shownin Fig. 4 but shown in Fig. 2 and Fig. 1.

As illustrated in Fig. 2 and Fig. 1, the iron band I4 is suppliedbetween guiding plates 31 and 31, pulled downwards by several pairs ofrollers Hi and H as well as 20 and 2| and the like, meanwhile held inposition by deviation-preventing plate 36, heated at the temperature ofabout 800 C. to be tempered, guided by another deviation-preventingplate 36 and discharged from the final pair of rollers acting similarlyto those Ill and H or 20 and 2|, the heated iron band entering into aquenching oil bath not shown in the drawings to be tempered.

According to the present invention iron band or strip to be tempered orhardened may be moved through a definite and accurate passage in a highfrequency electric current induction device to be heated at itspredetermined portion and at the optimum temperature and in apredetermined grade along its lengthwise direction, by means of saidseveral pairs of holding rollers driven in; equal velocity, said pairsof pressing rollers in concert with" said elliptical openings, and saiddeviation-preventing plates, thus always evenly tempered or hardenedsaws or the like being obtained.

It is to be understood that the-invention is not limited to the specificembodiment herein shown and described, but may be carried out: in otherways without departure from its spirit.

What I claim as new and desire to secure by Letters Patent of theUnitedStates-is":

A tempering apparatus for making band saws or the like using a highfrequency electric current induction device, characterized by the factthat anironb'arid} t'o'b'e treated for making a saw or the like ispulled downwards, successively and equally, by several? pairs ofrollers, a roller of e'aichpair pressed, against the other rollerrespectively by means oi'-press ing.'ro1lers' attached REFERENCES CITEDhe following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,479,949 MacPheat Aug. 23, 19492,525,203 Bostroem Oct. 10, 1950 2,526,518 Turrettini' Oct, 17, 1950FOREIGN PATENTS Number Country Date GreatBritain Mar. 24;, 1949

